A Grim's vane wheel in an azimuthin propulsion unit
Publication Date: 2017-Jan-31
The IP.com Prior Art Database
An azimuthing propulsion unit may use a pulling propeller. The slip stream from the propeller interacts with the strut and where installed the fin and the X-tail. A Grim's vane wheel positioned downstream of the propeller uses the rotational slip stream of the propeller to generate additional thrust for the azimuthing propulsion unit.
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A GRIM'S VANE WHEEL IN AN AZIMUTING PROPULSION UNIT
An azimuthing propulsion unit type propulsion unit may use a pulling propeller. The slip
stream from the propeller interacts with the strut and where installed the fin and the X-
tail. An example of an azimuthing propulsion unit is Azipod® (registered trade mark of
ABB) manufactured by ABB.
The Grim's vane wheel uses the rotational slip stream of the propeller to generate
additional thrust for an azimuthing propulsion unit.
The Grim's vane wheel has been used on conventional shaft lines, but not on
azimuthing propulsion units, especially not propulsion units equipped with pulling
By utilizing the rotational slip stream from the propeller to create more thrust for the unit
one can increase the efficiency of the propulsion unit.
The concept of the Grim’s vane wheel is to have a freely turning “propeller” behind the
actual propeller. I.e. when the propeller turns it introduces a rotational component in the
flow field behind it. The Grim’s vane wheel consists of a freely turning hub which is set
on the propeller shaft, but by bearings separated from the rotational motion of the shaft.
The vanes extended out from the hub are then designed so that the lower part of the
vane interact with the rotating slip stream from the propeller and hence, gives the vane
wheel a rotational motion. The upper part of the vane is then designed to give a thrust